JP7462888B2 - Buried connector and parts for mounting the buried connector - Google Patents

Description

The present invention relates to a buried connector equipped with a bolt or nut that is buried in the surface of a part and is used to connect the parts together, and a part to which the buried connector is attached.

Conventionally, when two parts are connected using screws, a buried connector equipped with a bolt or nut may be attached to the surface of one of the parts. For example, in a plastic vehicle part such as an intake manifold that constitutes an engine's intake system, a metal buried nut is embedded in the surface of the plastic vehicle part to screw another part to the plastic vehicle part. For example, the following Patent Document 1 discloses a buried nut as a buried connector in which multiple engagement projections are formed on the outer circumferential surface of the buried part body that is formed as a cylinder and buried in the surface of the object to be attached.

JP 2015-183695 A

However, in the buried connector shown in Patent Document 1, there is always a need to improve the mounting strength of the buried part body relative to the object to which it is attached.

The present invention was made to address the above problems, and its purpose is to provide a buried connector and a buried connector mounting part that can improve the mounting strength of the buried part body to the object to which it is attached.

In order to achieve the above-mentioned object, the present invention is characterized in that it is an embedded type coupling device which comprises an embedded section body formed in a columnar or cylindrical shape, a group of engaging protrusions consisting of a plurality of engaging protrusions formed on the outer peripheral surface of the embedded section body and protruding radially outward, and a male threaded portion extending in the axial direction from one end of the embedded section body, and the embedded section body is embedded in the surface layer of the object to be attached, and the embedded section body is provided with a small uneven portion consisting of a plurality of unevennesses having a protrusion amount or depth less than the protrusion amount of the engaging protrusions, on at least one of both end portions in the axial direction, and the small uneven portion is formed to protrude from the outer peripheral surface of the embedded section body and is formed to protrude radially outward further than the engaging protrusions.

In addition, in order to achieve the above-mentioned object, the present invention is characterized in that it is an embedded type coupling device which comprises an embedded portion body formed in a cylindrical shape, a group of engaging protrusions consisting of a plurality of engaging protrusions formed on the outer peripheral surface of the embedded portion body and protruding radially outward, and a female thread portion formed on the inner peripheral surface of the embedded portion body, and the embedded portion body is embedded in the surface layer of the object to be attached, and the embedded portion body has a small uneven portion consisting of a plurality of unevennesses having a protrusion amount or depth less than the protrusion amount of the engaging protrusions on at least one of both end portions in the axial direction, and the small uneven portion is formed to protrude from the outer peripheral surface of the embedded portion body and is formed to jut out radially outward beyond the engaging protrusions.

In these cases, the embedded connectors are either insert type, which is embedded in the object to be attached when the object is molded, or outsert type, which is pressed or screwed into the object once it has been molded.

According to the features of the present invention configured in this way, the buried type connector has a small uneven portion on the buried part body in addition to the engaging projection group, which increases the frictional resistance between the attachment object and the buried part body, thereby improving the attachment strength of the buried part body to the attachment object, and suppresses co-rotation and pull-out during screw tightening, thereby withstanding high tightening force and improving the connection force. Furthermore, according to the buried type connector of the present invention, the small uneven portion is formed to protrude from the outer circumferential surface of the buried part body, so that a high attachment strength can be achieved even with an outsert type buried type connector. Furthermore, according to the buried type connector of the present invention, the small uneven portion is formed to protrude radially outward from the projections that constitute the engaging projection group, so that a high attachment strength can be achieved even with an outsert type buried type connector.

Another feature of the present invention is an embedded-type coupling device which comprises an embedded portion body formed in a columnar or cylindrical shape, a group of engaging protrusions consisting of a plurality of engaging protrusions formed on the outer peripheral surface of the embedded portion body and protruding radially outward, and a male threaded portion extending in the axial direction from one end of the embedded portion body, and which is embedded in the surface layer of the object to be attached, wherein the embedded portion body has a small uneven portion consisting of a plurality of unevennesses having a protrusion amount or depth less than the protrusion amount of the engaging protrusions , on at least one of both end portions in the axial direction, and has a flange portion which protrudes radially outward in a flange-like manner on the portion which is closer to the surface of the object to be attached than the group of engaging protrusions, and the flange portion has an outer peripheral surface which is formed in a convex shape protruding radially outward.

Another feature of the present invention is an embedded-type coupling device which comprises an embedded portion body formed in a cylindrical shape, a group of engaging protrusions consisting of a plurality of engaging protrusions formed on the outer peripheral surface of the embedded portion body and protruding radially outward, and a female thread portion formed on the inner peripheral surface of the embedded portion body, and which is embedded in the surface layer of the object to be attached, wherein the embedded portion body has a small uneven portion consisting of a plurality of unevennesses having a protrusion amount or depth less than the protrusion amount of the engaging protrusions on at least one of both end portions in the axial direction , and has a flange portion which protrudes radially outward in a flange-like manner on the portion which is closer to the surface of the object to be attached than the group of engaging protrusions, and the flange portion is formed in a convex shape whose outer peripheral surface protrudes radially outward.

In these cases, the embedded type connectors are either of the insert type, which is embedded integrally into the object to be attached when the object is molded, or of the outsert type, which is attached by pressing or screwing into the object once it has been molded.

According to the features of the present invention configured in this way, the embedded connector has a small uneven portion in addition to the engaging projection group on the embedded body, which increases the frictional resistance between the attachment object and the embedded body, thereby improving the attachment strength of the embedded body to the attachment object, and suppresses co-rotation and pull-out during screw tightening, thereby withstanding high tightening force and improving the connection force. In addition, according to the embedded connector of the present invention, the embedded body has a flange portion that protrudes radially outward in a flange-like shape on the part of the embedded body that is closer to the surface of the attachment object than the engaging projection group, and the outer circumferential surface of this flange portion is formed in a convex shape that protrudes radially outward, making it difficult for the embedded body to be pulled out from the attachment object. In this case, the flange portion can be formed into a curved surface whose outer circumferential surface bulges in a convex manner, or a stepped shape that protrudes in a convex manner.

Another feature of the present invention is an embedded-type coupling device which comprises an embedded section main body formed in a columnar or cylindrical shape, an engaging projection group consisting of a plurality of engaging projections formed on the outer peripheral surface of the embedded section main body and protruding radially outward, and a male thread portion extending in the axial direction from one end of the embedded section main body, and which is embedded in the surface layer of the object to be attached, wherein the embedded section main body has a small uneven portion consisting of a plurality of unevennesses having a protrusion amount or depth less than the protrusion amount of the engaging projections on at least one of both end portions in the axial direction, and has an adjacent protruding portion adjacent to the engaging projection group and protruding radially outward more than the engaging projection group, the adjacent protruding portion has a tapered portion whose outer diameter continuously narrows toward the engaging projection group, and the tapered portion has a plurality of tapered protrusions formed protruding radially outward.

Another feature of the present invention is an embedded type coupling device which comprises an embedded portion main body formed in a cylindrical shape, an engaging projection group consisting of a plurality of engaging projections formed on the outer peripheral surface of the embedded portion main body and protruding radially outward, and a female thread portion formed on the inner peripheral surface of the embedded portion main body, and which is embedded in the surface layer of the object to be attached, wherein the embedded portion main body has a small uneven portion consisting of a plurality of unevennesses having a protrusion amount or depth less than the protrusion amount of the engaging projections on at least one of both end portions in the axial direction, and has an adjacent protruding portion adjacent to the engaging projection group and protruding radially outward beyond the engaging projection group, the adjacent protruding portion has a tapered portion whose outer diameter continuously narrows toward the engaging projection group, and the tapered portion has a plurality of tapered protrusions formed protruding radially outward.

In these cases, the embedded type connectors are either of the insert type, which is embedded integrally into the object to be attached when the object is molded, or of the outsert type, which is attached by pressing or screwing into the object once it has been molded.

According to the features of the present invention configured in this manner, the embedded type coupling device has a small uneven portion on the embedded part body in addition to the engaging projection group, which increases the frictional resistance between the attachment object and the embedded part body and improves the attachment strength of the embedded part body to the attachment object, and can withstand high tightening forces by suppressing co-rotation and pull-out when tightening the screws and improving the connecting force. Also, according to the embedded type coupling device of the present invention, a tapered portion is provided on the adjacent protruding portion formed in a state of protruding radially outward from the engaging projection group at a position adjacent to the engaging projection group, and this tapered portion is provided with a tapered portion protrusion, so that the attachment strength after attachment to the attachment object can be improved while suppressing an increase in press-in resistance when press-fitted into the attachment object.

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In addition, the present invention can be implemented not only as an invention for a buried connector, but also as an invention for a buried connector mounting part to which a buried connector is attached.

Specifically, the embedded connector mounting part may have the embedded connector described in any one of claims 1 to 6 embedded in the surface layer. In this case, the embedding method may be a method of embedding the embedded connector integrally into the object to be attached when the object to be attached is molded, or a method of embedding the embedded connector by pressing or screwing into the object to be attached once molded. According to these methods, the embedded connector mounting part can be expected to have the same effect as the embedded connector.

1 is a perspective view showing a schematic external configuration of a buried type connector according to one embodiment of the present invention; FIG. 2 is a front view showing a schematic external configuration of the embedded type connector shown in FIG. 1 . 2 is a perspective view showing an outline of the external configuration of a semi-finished product of the embedded type connector shown in FIG. 1 . FIG. 2 is a cross-sectional view of the embedded coupler and the embedded coupler mounting component, showing a state in which the embedded coupler shown in FIG. 1 is embedded in an object to which the coupler is to be attached. FIG. FIG. 11 is a front view showing a schematic external configuration of a buried type connector according to a modified example of the present invention. FIG. 13 is a perspective view showing an outline of the external configuration of a buried type coupler according to another modified example of the present invention. FIG. 11 is a cross-sectional view of a buried-type coupler and a buried-type coupler mounting component, showing a state in which the buried-type coupler according to another modified example of the present invention is buried in an object to which the coupler is attached.

The following describes an embodiment of a buried connector and a buried connector mounting part according to the present invention with reference to the drawings. FIG. 1 is a perspective view showing the outline of the external configuration of a buried connector 100 according to the present invention. FIG. 2 is a front view showing the outline of the external configuration of the buried connector 100 shown in FIG. 1. Note that the figures referred to in this specification may be schematic, with some components exaggerated to facilitate understanding of the present invention, and therefore the dimensions and ratios between the components may differ.

This embedded type connector 100 is a connector that is embedded in the surface of a resin part, for example, an intake manifold that constitutes the intake system of an engine of a self-propelled vehicle, in order to connect the resin part to another part, such as a cylinder head. Note that the part that is connected to the attachment object WK, such as the intake manifold in which the embedded type connector 100 is embedded, via the embedded type connector 100 is referred to as the connected object (not shown).

(Configuration of the embedded type connector 100)
The embedded type coupling device 100 includes an embedded part body 101. The embedded part body 101 is a part in which the engaging projection group 103, the small unevenness portion 111, and the flange portion 112 are formed, and is configured by forming a metal material (e.g., carbon steel) into a cylindrical shape. More specifically, the embedded part body 101 is configured by the projection forming portion 102, the small unevenness forming portion 110, and the flange portion 112, which are formed with three different outer diameters.

The protrusion forming portion 102 is the portion where the engaging protrusion group 103 is formed, and is formed in a cylindrical shape with the smallest diameter among the embedded portion main body 101. In this case, the axial length of the protrusion forming portion 102 is appropriately set according to the attachment strength to the attachment object WK.

The group of engaging protrusions 103 is a hooking portion that hooks into the inside of the attachment object WK to ensure attachment strength, and is composed of a collection of multiple engaging protrusions 104. The engaging protrusions 104 are formed in a mountain shape that protrudes intermittently from the outer circumferential surface of the protrusion forming part 102 along the circumferential direction of the protrusion forming part 102. In this embodiment, eight engaging protrusions 104 are formed at equal intervals in the circumferential direction of the protrusion forming part 102, and six to seven are formed in the axial direction of the protrusion forming part 102.

In this case, the engaging protrusions 104 arranged on the axial side of the protrusion forming portion 102 are formed in a straight line along the coaxial direction, but the engaging protrusions 104 may be arranged in a staggered pattern on the coaxial side. As a result, in this embodiment, the engaging protrusion group 103 is formed as a male screw shape as a whole by the multiple intermittent engaging protrusions 104.

The engaging protrusions 104 are formed with overhanging portions 105. The overhanging portions 105 are portions that, together with the engaging protrusions 104, hook into the inside of the attachment object WK to increase the attachment strength, and are formed on the outer edge of each engaging protrusion 104, overhanging toward the circumferential side of the protrusion forming portion 102. More specifically, the overhanging portions 105 are formed overhanging on the ridgeline that extends between the tip of the engaging protrusion 104 and the surface of the protrusion forming portion 102.

In this case, the protrusion 105 is formed so that the amount of protrusion gradually increases from the tip of the engagement protrusion 104 toward the surface of the protrusion forming portion 102. It is to be noted that the engagement protrusion 104 may be configured without the protrusion 105.

The small unevenness forming portion 110 is the portion where the small unevenness portion 111 is formed, and is formed in a cylindrical shape with an outer diameter larger than the protrusion forming portion 102. In this case, the axial length of the small unevenness forming portion 110 is formed to be shorter than the axial length of the protrusion forming portion 102 in this embodiment, but this is set appropriately depending on the attachment strength to the attachment object WK, and it may be formed to be longer than the axial length of the protrusion forming portion 102.

The small unevenness portion 111 is a portion that hooks into the inside of the attachment object WK to increase the attachment strength, and is composed of minute unevenness. In this case, the minute unevenness that composes the small unevenness portion 111 is unevenness with a protrusion amount or depth that is less than the protrusion amount of the engagement protrusion 104, and 1 mm is preferable as the minimum protrusion amount or depth. In this embodiment, the small unevenness portion 111 is composed of an iris-shaped knurling, which is a collection of countless quadrangular pyramid-shaped protrusions, formed on the entire surface of the small unevenness forming portion 110.

In this case, the small unevenness portion 111 is formed to protrude radially outward from the engaging protrusion 104 because the small unevenness forming portion 110 is formed to have a larger outer diameter than the protrusion forming portion 102. The depth of the knurling is generally formed to 1/2 the pitch, but it may be formed to be deeper or shallower than the pitch.

The flange portion 112 is a portion that is embedded in the surface layer of the attachment object WK with its end face exposed, and is formed in a disk shape with an outer diameter larger than the small unevenness forming portion 110. In other words, the flange portion 112 protrudes in a flange shape from the small unevenness forming portion 110 and constitutes the largest outer diameter portion of the embedded portion main body 101. This flange portion 112 has a male thread portion 120 formed on the side opposite the small unevenness forming portion 110.

The male threaded portion 120 is the portion to which the object to be attached is attached, and is configured by forming a male thread on the surface of a cylinder extending along the axis of the flange portion 112, which meshes with a female thread (not shown) provided on the object to be attached. A guide protrusion 121 is formed on the tip of this male threaded portion 120.

The guide protrusion 121 is a part that prevents the male threaded portion 120 from being erroneously screwed in at an angle when fitting the male threaded portion 120 into a female thread provided on an object to be attached, and is formed in a cylindrical shape extending in the axial direction from the tip of the male threaded portion 120. In this case, the guide protrusion 121 is formed with a smaller diameter than the male threaded portion 120.

(Method of manufacturing the embedded connector 100)
Next, a manufacturing method of the buried type coupler 100 thus configured will be briefly described. First, in the first step, an operator who manufactures the buried type coupler 100 forms the buried part main body 101 in a stepped cylindrical shape and the round bar-like male threaded part 120 in which a male thread is not formed, as shown in Fig. 3. Specifically, the operator performs machining (e.g., forging or cutting) on a rod-shaped or wire-shaped metal material to form the protrusion forming part 102, the small irregularity forming part 110, the flange part 112, and the male threaded part 120.

In this case, the worker also forms the convex portions 102a on the outer peripheral surface of the protrusion forming portion 102. The convex portions 102a are preformed portions for forming the engagement protrusions 104 and the overhanging portions 105, respectively, and extend protrudingly along the axial direction of the protrusion forming portion 102 and are formed at intervals along the circumferential direction of the protrusion forming portion 102.

Next, in the second step, the worker forms the male thread portion 120. Specifically, the worker uses cutting or rolling to machine a male thread on the outer circumferential surface of the round bar extending in the axial direction from the flange portion 112. In this case, the worker also forms a guide protrusion 121 at the tip of the male thread portion 120.

Next, in the third step, the worker forms the small unevenness portion 111 on the outer peripheral surface of the small unevenness forming portion 110. Specifically, the worker forms the small unevenness portion 111 by knurling (rolling). That is, the worker presses a knurling tool against the outer peripheral surface of the small unevenness forming portion 110 to deform the outer peripheral surface of the small unevenness forming portion 110, thereby forming the small unevenness portion 111. The worker can also form the small unevenness portion 111 by cutting.

Next, in the fourth step, the worker forms the engaging protrusion 104 and the protruding portion 105 on the outer peripheral surface of the protrusion forming portion 102. Specifically, the worker forms the engaging protrusion 104 and the protruding portion 105 by rolling. That is, the worker presses a die on which male thread-shaped teeth are formed to form the male thread shape that constitutes the engaging protrusion 104 as a whole against the protrusion forming portion 102, thereby plastically deforming mainly the convex portion 102a of the protrusion forming portion 102 to form the engaging protrusion 104.

When forming the engaging protrusion 104, the mold for forming the engaging protrusion 104 is pressed against the protrusion 102a of the protrusion forming portion 102 to form the protrusion 102a and the valley 102b. In this case, the overhang 105 is formed by part of the material in the portion where the valley 102b is formed escaping to the ridge side of the engaging protrusion 104. In other words, the overhang 105 is formed at the same time as the rolling process of the engaging protrusion 104. The embedded type connector 100 is manufactured by each of these processing steps (see Figure 1). The order of the above-mentioned second, third and fourth steps can be appropriately changed.

(Operation of the embedded connector 100)
Next, a description will be given of the operation of the thus configured embedded type coupler 100. First, an operator prepares the embedded type coupler 100 and the object WK to be attached to the embedded type coupler 100. In this case, the object WK to be attached to the embedded type coupler 100 is molded in advance in a separate process by injection molding of a resin material.

Next, the worker embeds the embedded connector 100 in the surface layer of the attachment object WK, as shown in FIG. 4. Specifically, the worker can embed the embedded connector 100 in the surface layer of the attachment object WK using a press-in method in which the embedded connector 100 is directly pressed into the surface layer of the attachment object WK, or a hot press-in method in which the attachment object WK is heated and softened, and then the embedded connector 100 is pressed into the surface layer of the attachment object WK.

In this case, the thermal press-fit method includes a method of directly heating the attachment object WK using ultrasound or induced current to soften it and press-fit the embedded connector 100 into the attachment object WK, as well as a method of using ultrasound or induced current to press-fit the heated embedded connector 100 into the attachment object WK. When embedding the embedded connector 100 in the surface layer of the attachment object WK, a pilot hole may be formed in the surface layer of the attachment object WK before pressing-fitting the embedded connector 100, but when pressing-fitting the embedded connector 100 into the surface layer of the heated attachment object WK, the pilot hole may be omitted.

The worker embeds the embedded connector 100 so that the end face of the flange portion 112 is flush with the surface of the object WK to which it is to be attached. This allows the worker to attach the embedded connector 100 to the object WK with the male thread portion 120 standing upright from the surface of the object WK.

Next, the worker prepares the object to be attached to the object to be attached WK, and then connects the object to be attached to the object to be attached WK. Specifically, the worker screws the female thread of the object to be attached into the male thread portion 120 of the embedded type coupler 100 protruding from the object to be attached WK. In this case, since the embedded type coupler 100 has a small uneven portion 111 formed in addition to the engagement protrusion 104, the frictional resistance against the object to be attached WK is increased, and it is possible to suppress the co-rotation and pull-out. And, since the embedded type coupler 100 has a small uneven portion 111 formed in addition to the engagement protrusion 104, even after the object to be attached is attached, it is possible to suppress the co-rotation and pull-out by increasing the frictional resistance against the object to be attached WK.

As can be understood from the above description of operation, according to the above embodiment, the embedded type connector 100 has a small uneven portion 111 in addition to the engaging projection group 103 on the embedded body 101, which increases the frictional resistance between the attachment object WK and the embedded body 101, improving the attachment strength of the embedded body 101 to the attachment object WK, and suppressing co-rotation and pull-out during screw tightening, thereby enabling the connector to withstand high tightening forces and improve the connection strength.

Furthermore, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the purpose of the present invention. In the following explanation of each modification, the same parts as those in the above-described embodiment in the referenced figures are given the same reference numerals, and the explanation of the overlapping parts is omitted.

For example, in the above embodiment, the small unevenness portion 111 is configured with an iris-shaped knurling. However, the small unevenness portion 111 may be configured with multiple unevennesses with a protrusion amount or depth less than the protrusion amount of the engagement protrusion 104. Therefore, the small unevenness portion 111 can be configured, for example, with a protrusion or groove extending in the axial direction of the embedded part main body 101, a protrusion or groove extending in the circumferential direction of the embedded part main body 101, or a protrusion or recessed dimple that protrudes in a regular or irregular arrangement in the small unevenness forming portion 110.

That is, the small unevenness portion 111 can be formed not only by protrusions that protrude from the surface of the small unevenness forming portion 110, but also by concave recesses that are recessed from the surface of the small unevenness forming portion 110. Also, instead of forming the small unevenness portion 111 on the entire surface of the small unevenness forming portion 110, the small unevenness portion 111 can be formed only on a part of the small unevenness forming portion 110.

In the above embodiment, the small uneven portion 111 is formed to protrude radially outward from the embedded portion body 101 beyond the engaging protrusion 104. However, the small uneven portion 111 can also be formed at the same radial position as the engaging protrusion 104 (i.e., flush) or radially inward from the engaging protrusion 104.

In the above embodiment, the small uneven portion 111 is formed in a portion of the embedded body 101 that is closer to the surface of the mounting object WK than the engaging protrusion group 103 (in other words, the portion on the male threaded portion 120 side). However, as shown in FIG. 5, the small uneven portion 111 can also be formed on the tip side of the protrusion forming portion 102 on the opposite side of the surface of the mounting object WK (the male threaded portion 120 side) than the engaging protrusion group 103 in the embedded body 101.

In this case, the small unevenness portion 111 may be formed so as to protrude radially outward from the engaging protrusion 104 of the embedded portion main body 101, may be formed flush with the engaging protrusion 104, or may be formed radially inward from the engaging protrusion 104. This makes it possible to easily insert the embedded type coupling device 100 by suppressing the initial large resistance to press-fitting when it is pressed into the attachment object WK.

In addition, in FIG. 5, the embedded body 101 has a cylindrical intermediate portion 113 formed of a smooth curved surface without small unevenness 111 between the protrusion forming portion 102 and the flange portion 112. This allows the embedded connector 100 to position the engaging protrusion group 103 and small unevenness 111 deep inside the surface layer of the attachment object WK. However, the embedded body 101 can also be formed by directly connecting the protrusion forming portion 102 and the flange portion 112, omitting the intermediate portion 113.

The small uneven portion 111 can also be formed on both the surface side of the mounting object WK (the male thread portion 120 side) of the engaging protrusion group 103 in the embedded portion main body 101 and the tip side of the protrusion forming portion 102 on the opposite side to the surface side. In other words, the small uneven portion 111 can also be formed on both sides of the axial direction of the engaging protrusion group 103 by also forming it in the middle portion 113 in FIG. 5.

The intermediate portion 113 is formed at a position adjacent to the engaging projection group 103, protruding radially outward from the engaging projection group 103. In other words, the intermediate portion 113 corresponds to the adjacent protruding portion according to the present invention. The intermediate portion 113 is formed with a tapered portion 114 whose outer diameter is continuously smaller than the protrusion forming portion 102, and a part of the engaging projection 104 constituting the engaging projection group 103 is formed in the tapered portion 114 as a tapered projection portion 115.

This allows the embedded connector 100 to improve the attachment strength after attachment to the attachment object WK while suppressing an increase in the press-in resistance when pressed into the attachment object WK. The tapered portion 114 can also be formed in the small unevenness forming portion 110 in the above embodiment. In other words, the small unevenness forming portion 110 in the above embodiment corresponds to the adjacent protrusion portion according to the present invention.

The tapered protrusion 115 may be formed in the same shape as the engaging protrusion 104, or may be formed in a different shape from the engaging protrusion 104. In FIG. 5, the tapered protrusion 115 is formed in the same axial direction adjacent to the engaging protrusions 104 arranged along the axial direction of the embedded body 101 (in other words, formed at the same position in the circumferential direction), thereby suppressing an increase in the press-in resistance when pressed into the attachment object WK. However, the tapered protrusion 115 can be formed at a different position in the circumferential direction from the engaging protrusion 104 to improve the pull-out resistance of the embedded connector 100 from the attachment object WK. The tapered protrusion 115 can also be formed on an embedded connector 100 in which the small uneven portion 111 is not formed.

In the above embodiment, the embedded connector 100 is configured with a male thread portion 120. However, as shown in FIG. 6, the embedded connector 100 can also be configured with a female thread portion 130 instead of the male thread portion 120. In this case, the female thread portion 130 can be formed on the inner periphery of the cylindrical embedded body 101. The embedded connector 100 can also be configured with both the male thread portion 120 and the female thread portion 130.

In the above embodiment, the buried body 101 is formed in a columnar shape. However, the buried body 101 can be formed in a bottomed cylindrical shape.

In the above embodiment, the flange portion 112 has an outer peripheral surface that is parallel to the axial direction of the embedded portion main body 101. However, as shown in FIG. 7, the flange portion 112 can also have an outer peripheral surface that is curved and bulges outward in a convex manner. This makes it difficult for the embedded type connector 100 to pull out the embedded portion main body 101 from the attachment target WK. The flange portion 112 can also be formed into a stepped shape that protrudes convexly, other than a curved outer peripheral surface that bulges convexly.

In the above embodiment, the embedded connector 100 is configured with eight engaging protrusions 104 formed at equal intervals around the circumferential direction of the protrusion-forming portion 102, and six to seven engaging protrusions formed in the axial direction of the protrusion-forming portion 102. However, the number of engaging protrusions 104 formed is not necessarily limited to the above embodiment. Therefore, the embedded connector 100 can be configured with seven or less or nine or more engaging protrusions 104 formed at equal or unequal intervals around the circumferential direction of the protrusion-forming portion 102, and can also be configured with five or less or eight or more engaging protrusions formed in the axial direction of the protrusion-forming portion 102.

In the above embodiment, the engaging protrusion group 103 is configured to be formed into a male thread shape as a whole. However, the engaging protrusion group 103 does not necessarily have to be formed into a male thread shape, and the engaging protrusions 104 may be arranged on the protrusion forming portion 102 in a regular or random manner other than a spiral shape to form a shape other than a male thread shape. For example, the engaging protrusion group 103 may be formed into a ring shape with the engaging protrusions 104 formed intermittently along the circumferential direction.

In the above embodiment, the buried body 101 is configured with a flange portion 112. However, the buried body 101 can also be configured without the flange portion 112.

In the above embodiment, the embedded connector 100 is pressed into the molded mounting object WK. However, the embedded connector 100 can be installed on the molded mounting object WK by a method other than pressing, for example, by screwing into a hole formed in the mounting object WK or a female thread formed in the same hole. That is, the embedded connector 100 in the above embodiment is an outsert nut that is attached to the mounting object WK once molded by pressing or screwing. However, the embedded connector 100 can be configured as an insert nut that is embedded and attached to the mounting object WK when the mounting object WK is molded, with respect to the mounting object WK in which the embedded connector 100 is embedded. For example, the embedded connector 100 may be injection molded integrally with the mounting object WK by pouring molten resin material into a molding die in which the embedded connector 100 is placed.

In the above embodiment, the embedded connector 100 is made of a metal material. However, the embedded connector 100 can also be made of a material other than metal, such as a resin material or wood. Therefore, the embedded connector 100 can be embedded in parts other than engine parts of a self-propelled vehicle, such as furniture such as desks and chairs, or concrete blocks.

WK: Object to be attached,
100: Buried type coupling device, 101: Buried part main body, 102: Protrusion forming part, 102a: Convex part, 102b: Valley part, 103: Engagement protrusion group, 104: Engagement protrusion, 105: Protruding part,
110: Small unevenness forming portion, 111: Small unevenness portion, 112: Flange portion, 113: Intermediate portion, 114: Tapered portion, 115: Tapered portion protrusion portion,
120: male thread portion; 121: guide protrusion;
130...Female thread portion.

Claims (7)

A buried portion main body formed in a columnar or cylindrical shape;
a group of engaging projections formed on an outer peripheral surface of the embedded portion body so as to protrude radially outward;
A buried type connector having a male screw portion extending from one end of the buried portion body in an axial direction, the buried portion body being buried in a surface layer of an object to be attached,
The buried portion body is
a small uneven portion having a projection or depth smaller than that of the engagement projection, the small uneven portion being formed of a plurality of projections and recesses, at least on one side of both ends in the axial direction ;
The small uneven portion is
The embedded portion body is formed so as to protrude from an outer peripheral surface thereof,
A buried type connector characterized in that it is formed so as to protrude radially outward beyond the engaging projection . A cylindrically formed buried portion main body;
a group of engaging projections formed on an outer peripheral surface of the embedded portion body so as to protrude radially outward;
A buried type connector having a female screw portion formed on an inner peripheral surface of the buried portion body, the buried portion body being buried in a surface layer of an object to be attached,
The buried portion body is
a small uneven portion having a projection or depth smaller than that of the engagement projection, the small uneven portion being formed of a plurality of projections and recesses, at least on one side of both ends in the axial direction ;
The small uneven portion is
The embedded portion body is formed so as to protrude from an outer peripheral surface thereof,
A buried type connector characterized in that it is formed so as to protrude radially outward beyond the engaging projection . A buried portion main body formed in a columnar or cylindrical shape;
a group of engaging projections formed on an outer peripheral surface of the embedded portion body so as to protrude radially outward;
A buried type connector having a male screw portion extending from one end of the buried portion body in an axial direction, the buried portion body being buried in a surface layer of an object to be attached,
The buried portion body is
a small uneven portion having a projection or depth smaller than that of the engagement projection, the small uneven portion being formed of a plurality of projections and recesses, at least on one side of both ends in the axial direction ;
a flange portion that protrudes radially outward in a flange-like shape at a portion that is closer to the surface of the object than the engaging projection group;
The flange portion is
A buried type connector characterized in that its outer peripheral surface is formed in a convex shape that protrudes radially outward . A cylindrically formed buried portion main body;
a group of engaging projections formed on an outer peripheral surface of the embedded portion body so as to protrude radially outward;
A buried type connector having a female screw portion formed on an inner peripheral surface of the buried portion body, the buried portion body being buried in a surface layer of an object to be attached,
The buried portion body is
a small uneven portion having a projection or depth smaller than that of the engagement projection, the small uneven portion being formed of a plurality of projections and recesses, at least on one side of both ends in the axial direction ;
a flange portion that protrudes radially outward in a flange-like shape at a portion that is closer to the surface of the object than the engaging projection group;
The flange portion is
A buried type connector characterized in that its outer peripheral surface is formed in a convex shape that protrudes radially outward . A buried portion main body formed in a columnar or cylindrical shape;
a group of engaging projections formed on an outer peripheral surface of the embedded portion body so as to protrude radially outward;
A buried type connector having a male screw portion extending from one end of the buried portion body in an axial direction, the buried portion body being buried in a surface layer of an object to be attached,
The buried portion body is
a small uneven portion having a projection or depth smaller than that of the engagement projection, the small uneven portion being formed of a plurality of projections and recesses, at least on one side of both ends in the axial direction ;
an adjacent protruding portion adjacent to the engaging projection group and protruding radially outward from the engaging projection group;
The adjacent overhanging portion is
a tapered portion having an outer diameter that is gradually reduced toward the engaging projection group;
The tapered portion is
A buried connector comprising a plurality of tapered protrusions formed to protrude radially outward . A cylindrically formed buried portion main body;
a group of engaging projections formed on an outer peripheral surface of the embedded portion body so as to protrude radially outward;
A buried type connector having a female screw portion formed on an inner peripheral surface of the buried portion body, the buried portion body being buried in a surface layer of an object to be attached,
The buried portion body is
a small uneven portion having a projection or depth smaller than that of the engagement projection, the small uneven portion being formed of a plurality of projections and recesses, at least on one side of both ends in the axial direction ;
an adjacent protruding portion adjacent to the engaging projection group and protruding radially outward from the engaging projection group;
The adjacent overhanging portion is
a tapered portion having an outer diameter that is gradually reduced toward the engaging projection group;
The tapered portion is
A buried connector comprising a plurality of tapered protrusions formed to protrude radially outward . 7. A component for mounting a buried type connector, comprising: a buried type connector according to claim 1 , buried in a surface layer.

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